BX Plastics was a plastics engineering and production company. The company was one of three subsidiaries of the British Xylonite Company established by 1938. BX Plastics made xylonite (also known as celluloid or ivoride) and Lactoid (also known as casein) at a plant to the south of Brantham in Suffolk, on the north bank of the River Stour across the river from Manningtree in Essex. The company was liquidated in 1999.